File:Parasaurolophus skulls.jpg
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| Description |
Diagram comparing the narial crests of Parasaurolophus cyrtocristatus (a) and Parasaurolophus walkeri (b). |
| Date | 1961 |
| Source | http://digitallibrary.amnh.org/dspace/handle/2246/1260 |
| Author | Ostrom, John H. |
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